How to find the index of a character, searching from right to left?-CodePudding

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How to find the index of a character, searching from right to left?

Time：10-31

Is there a JavaScript function to search for a character in a string (like string.indexOf), but search from right to left?

CodePudding user response：

This adds a function to strings.

String.prototype.indexOfRTL = function(search) {
  return (this.length - 1) - [...this].reverse().join("").indexOf(search);
}

Now using "Hello There!".indexOfRTL("e") will result in 10, for example.

CodePudding user response：

let a = 'Some guy';
let b = a.length - a.indexOf('m') - 1;
console.log(b);